I have two different engines, in two different planes and both die when I get to the top of vertical and chopping the trot. for doing a hammer head turn. One is a Saito 82a in an Edge 540, the other OS 91 Surpass in a Cub. I had a 4*60 with a ST 60 and it did Hammer heads great. I put the 91 from the Cub in it and now it Quits. Tanks are set up with three lines. Double Clunk, on fill and Carb. supply. I even completly Changed one tank, lines ect. Made knowdifference. In every other aspect both engines run great.
Suggestions?
Thanks